- The H4P heavy chain of inter-alpha-inhibitor family largely differs in the structure and synthesis of its prolin-rich region from rat to human. Soury, E., Olivier, E., Daveau, M., Hiron, M., Claeyssens, S., Risler, J.L., Salier, J.P. Biochem. Biophys. Res. Commun. (1998)